Practical_Antenna_Handbook_0071639586

I n d e x 753
ionospheric propagation, 45–79
fading, 59
gray line, 72–73
HF overview, 69–71
hops, 60–64
multihop, 60–64
reflection, 45
refraction, 47
scatter, 71, 75
skew paths, 71–72
skip distance, 48, 59
skip zone, 48, 59
sky wave, 59–79
ionospheric storms, 58
isophase plane, 24
isopotential line, 346
isotropic sources, 17–20, 95, 153, 182, 471–472,
545
power density, 471–472
ISWR (See current standing wave ratio)
J
j (complex plane operator), 84–85, 115,
724–725
(see also imaginary numbers)
Jansky, Carl, 497
JFET amplifier, 355–356
Johnson noise, 491–492
joints and bends in microwave waveguides,
466–469
J-Âpole antennas, 430
Jupiter reception, 498–499
K
k (Boltzmann's constant), 491
K factor (effective earth radius), 32–34
K9AY antenna, 359–360
Kaufmann, J. J., W1FV, 275
Kelvin (temperature), 491–492
Kennelly, Arthur, 45
Kennelly-ÂHeaviside layer, 45
kilohertz (kHz), 11–12
Koonce, Floyd, WA2WVL, 358
L
land mobile service, 375, 389
Law of Reciprocity (See reciprocity)
Lawson, James L. (deceased), Âex-ÂW2PV,
314
leakage resistance (at wire ends), 107
Leeson, David B., W6NL, 293, 294, 314,
554
Lewallen, Roy, W7EL, 329, 331, 334
light, speed of (c), 12, 13, 93
lightning (See grounding and ground
systems)
limited-Âspace antennas, 363–373
linear loading, 301–302, 405–406
line attenuation constant (α), 120
“line flattener” (ATU), 388
line-Âof-Âsight transmission, 28, 41
lines of force, 14
linked electric and magnetic fields, 14, 88,
92–93
loaded tower designs, 406–412
loading coils, 198–201, 289–291
logarithmic response, 710
logarithms, 707–710, 726
table of, 726
log-Âperiodic, 220–221
long baseline arrays, 497, 508
long path, 73–75
longwire(s), 225, 253–262, 360–361,
363–364
feedpoint impedance matching, 253
gain, 253, 256–257
grounding system, 253–255
artificial ground, 255
losses, 254
nonresonant, 253, 257–258,
nonresonant vee beam, 260, 261
patterns, 256–259, 261
radials, 254–255
receiving, 360–361
rhombic, 260–262
tilt angle, 261–262
standing vs. traveling wave, 256–258,
260
static charge buildup and discharge,
256
terminating resistor, 257–258
tuned feeder antennas, 221–224
location of feedpoint, 222
pattern vs. band, 223
vee beam, 258–261
loop antennas, 157–158, 207–216
large vs. small, 207